Plumbing pipe



FIG. 1 is a perspective view of a plumbing pipe;

FIG. 2 is another perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a rear view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines depict portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for a plumbing pipe, as shown and described. 